Cognomen Piriyayothakul (Piriyayothakul 
) , in the entire world, is a very rare family name. The cognomen Piriyayothakul is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Piriyayothakul | Thailand |
Sutas, Kantee, Yosakorn, and Pattaweekorn